4-(Chloromethyl)-3-(difluoromethyl)-5-(trifluoromethoxy)pyridine-2-carboxylic acid
2-Bromo-4-(difluoromethyl)pyridine-6-carboxylic acid
4-(Chloromethyl)-6-(difluoromethyl)-2-(trifluoromethoxy)pyridine-3-carboxylic acid
2-Bromo-3-(difluoromethyl)pyridine-6-carboxylic acid